# CLAUDE.md

This file provides guidance to Claude Code (claude.ai/code) when working with code in this repository.

## Commands

```bash
# Build
dotnet build

# Run (dev server at http://localhost:5225)
cd Schaad.Accounting.UI && dotnet run

# Publish
dotnet publish -c Release
```

There are no automated tests or lint commands.

## Architecture

**AccountingNext** is a Swiss personal accounting app built with ASP.NET Core 9 + Blazor (interactive server-side rendering) and Microsoft Fluent UI. Data is stored as XML files on disk — no database.

### Projects

| Project | Role |
|---|---|
| `Schaad.Accounting.UI` | Blazor web app — pages, dialogs, layout |
| `Schaad.Accounting.Services` | Business logic — balances, FX conversion, file import, charts |
| `Schaad.Accounting.Db` | Repository layer — XML serialization/deserialization |
| `Schaad.Accounting.Common` | Shared models, DTOs, interfaces |

### Data flow

```
Blazor Pages/Dialogs (UI)
  → Services (ViewService, FileService, ChartService)
  → Repositories (AccountRepository, TransactionRepository, …)
  → XML files: {DataPath}/{year}/{mandator}/Data/*.xml
```

Data is multi-year and multi-mandator. Each combination has its own directory under `DataPath` (configured in `appsettings.Development.json`). When a new year is opened, the previous year's data is copied as the starting point.

### Key services

- **ViewService** — aggregates account balances, applies FX rates, builds datasets for the UI
- **FileService** — imports bank statements (MT940, CAMT053 via external `Schaad.Finance.dll`), parses PDFs, manages backups
- **ChartService** — produces data for Plotly charts (assets, spendings over time)
- **SettingsService** — manages the active year, mandator, and file paths

### UI structure

Pages live in `Schaad.Accounting.UI/Components/Pages/`. Each page typically has a companion `Dialogs/` subfolder with Fluent UI dialog components for CRUD operations. The app is hardcoded to the `de-CH` culture.

### Key external dependencies

- `Microsoft.FluentUI.AspNetCore.Components` — UI components (FluentDataGrid, FluentDialog, etc.)
- `Plotly.Blazor` — charts
- `FreeSpire.PDF` — PDF parsing for bank statement imports
- `Schaad.Finance.dll` / `Schaad.Finance.Api.dll` — proprietary DLLs for MT940/CAMT053 parsing and FX rate lookups (FixerIo API key in `appsettings.Development.json`)

### Domain constants

`ClassIds` in `Schaad.Accounting.Common` defines the Swiss accounting chart-of-accounts classes: Activa=1000, Passiva=2000, Income=3000, Expenses=4000.